Perhaps you should try some spelling variations:
"city cooperation studies" » "city cooperation series", "city cooperation sources", "city cooperation implies", "city corporation studies", "china cooperation studies", "city corporations studies"
"mass communication iran" » "mass communication iraq", "mass communication ireland", "mass communication brands", "maps communication iran"
"jews colonization still" » "jews colonization failed", "jews colonization israel", "jews colonization songs", "its colonization still", "mars colonization still", "re colonization still"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("mass communication iran") OR ((("jews colonization still") OR ("city cooperation studies"))))~.
• Removing quotes may allow a broader search: (( mass communication iran ) or ((( jews colonization still ) or ( city cooperation studies ))))~.
• Adding a wildcard symbol may retrieve word variants: (("mass communication iran") or ((("jews colonization still") or ("city cooperation studies"))))*.